JPS5827509B2 - Cursor movement control device in screen split control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screen split display device in a display device,
In particular, the present invention relates to a device for controlling movement of a cursor for specifying a writing position when writing data on a display screen.

Generally, in devices that display characters and symbols on a CRT screen, the CRT screen is divided into a large number of subsections, and each subsection can display one character.

For example, these subdivisions can be divided into 16 lines and 40 lines on a CRT screen.
If formed in columns, it can be divided into 640 sections.

When writing characters in each subdivision on the CRT screen,
A short bright line called a cursor is displayed at the bottom of one subdivision in which characters are to be written to specify the character writing position.

After moving the cursor to a desired position, characters can be written on the square at a predetermined location on the screen by sending a character code from the keyboard or external computer to the CRT display device.

The address of the cursor is usually determined by storing a horizontal address and a vertical address in a cursor register, and the address is changed by a command signal from a keyboard or an external computer.

When a character is written at the location specified by the cursor on the screen, the contents of the cursor register are automatically updated so that the cursor is automatically advanced to the next character writing location.

In this way, when the cursor is sequentially moved to the right end of each line, it is automatically moved to the left end of the next line, and in the same way, it is sequentially moved to the bottom line.

The CRT display device was configured to display necessary items such as headings on the screen according to a predetermined program, and to write the required data next to each heading using the keyboard according to the cursor designation. something is well known.

Such CRT display devices are usually equipped with a cursor skip function, which skips a fixedly displayed heading or section that should be left blank, and moves to the next position where data is to be filled. Move the cursor directly to the
This prevents heading etc. from disappearing.

As explained above, the cursor is moved from the left edge of the screen to the right edge, skipping each line sequentially.
When divided into two sections, the cursor starts from the left edge of the first line of the left screen, then the first line of the left screen, the first line of the right screen, the second line of the left screen, the second line of the right screen, and the left screen. 3rd line...
It will be moved in the order of...

Since the left and right screens are each displayed in independent data blocks, not only is the word writing operation sloppy as data is written alternately line by line on the left and right screens. This results in the disadvantage that program processing becomes complicated.

In order to solve this problem, it is possible to create a program that first moves the cursor sequentially line by line only on the left screen, and then moves the cursor sequentially line by line on the right screen, but with this method, The drawback is that the program for moving the cursor sequentially following the lines is complicated.

Therefore, an object of the present invention is to provide a split-screen display device in which a display screen is arbitrarily divided into sections and different types of data can be displayed in each section. An object of the present invention is to provide a cursor movement control device that moves a specified cursor line by line for each division.

Another object of the present invention is to control a cursor movement in a screen split display device so that the cursor is moved line by line for each split section by a device provided independently of a data display diagram program attached to an external computer. The purpose is to provide a control device.

According to the present invention, a plurality of registers are provided for storing the addresses of the start and end positions of the cursor display section on a divided screen, and the cursor display position is compared with the contents of these registers. The cursor register is controlled so that the cursor register moves line by line in each section.

The viewer 10 shown in FIG. 1 is a raster scan type color display device, and its screen is arranged in 16 rows and 40 columns, and is therefore divided into 640 subsections.

One character can be displayed in one small section.

One line on the screen is composed of 12 rasters.

The refresh memory 12 shown in FIG. 1 stores characters and symbols displayed on the viewer 100 screens in the form of codes corresponding to display positions on the screen.

That is, the refresh memory 12 is composed of 15 rows and 40 rows of memory, and this memory 12 and the buffer memory 14 of 1 row and 40 columns are combined to create 640 pieces of memory consisting of 16 rows and 40 columns, the same as the viewer 100 screen. Memory is composed.

Each memory consists of a 16-bit storage element, with 8 bits used for character codes, 4 bits for cursor codes, 3 bits for color codes, and 1 bit for character blink command codes.

Code signals of characters and symbols displayed on the viewer 10 are stored from the external computer 16 or the keyboard 18 via the buffer memo'J 14 in the refresh memory 12 in correspondence with the display position on the screen of the viewer 100.

The operation for storing code signals in these memories 12 and 14 is performed by the display control circuit 20.

The buffer memory 14 is configured to store code signals for one line, that is, 40 characters, and character code signals are successively supplied to the decoder 22 as the raster is scanned.

Therefore, since one line consists of 12 rasters, the buffer memory 14 is circularly shifted 12 times while displaying one line.

When the display of one line is completed, the code signal of the next line is transferred from the output area of the refresh memory 12 to the buffer memory 14, and the =1- code signal of the line that has finished displaying is refreshed from the buffer memory 14. - Transferred to the input area of the memory 12.

In this way, every time one screen is displayed, circular shifts are performed twice within the memory consisting of the refresh memory 12 and the buffer memory 14.

Of the code signals successively output to the decoder 22, the character code is sent to the character signal generation circuit 24, the color code is sent to the color control circuit 26, and the cursor code is sent to the cursor control circuit 34.

As shown in FIG. 2, the character generation circuit 24 generates a luminance modulation signal based on a signal indicating how many [1 scanning lines] there are from the display control circuit 20, and outputs a luminance modulation signal to the color signal conversion circuit 2.
Send to 8.

This conversion circuit 28 generates three color signals corresponding to three colors using the luminance modulation signal from the character generation circuit 24 and the signal from the color control circuit 26, and supplies these to the viewer 10.

The viewer 10 uses this color signal and the horizontal and vertical level signals from the control circuit 20 to display characters or symbols in a predetermined color at a predetermined position on the CRT surface.

When writing characters or symbols on the screen of the viewer 10, first specify the writing position using the kernel, and then buffer the code signal from the external computer 16 or keyboard 18.
When fed into the memory 14, the code signal is stored in the corresponding code position circulating through the memory when it comes to the buffer memory 140 input area.

The position of the cursor is set by a horizontal cursor register 30 indicating its horizontal position and a vertical cursor register 32 indicating its vertical position.

The cursor position is on the external computer 16 or on the keyboard 1.
The signal from cursor head 8 is changed by changing the contents of cursor register 30 or 32 via leg circuit 34.

For example, when a character is written on the keyboard 18 where the cursor is located, the keyboard 1
8 provides a pulse to horizontal cursor register 30 via cursor control circuit 34 to move the cursor one column to the right.

When the cursor reaches the right edge of the screen, one pulse is supplied from the control circuit 34 to the vertical cursor register 32 to move the cursor to the next line, and the contents of the horizontal cursor register 30 are made into a signal corresponding to the level at the left edge. .

In this way, the cursor can be skipped if desired as it scans.

This cursor skip is a cursor skip set code and a cursor skip reset code that are inserted before and after one or more pieces of data that should be skipped by the cursor among each data stored in the refresh memory 12. specified by.

Skip these cursors. The code is successively output by the decoder 22 and supplied to the cursor control circuit 34.

This control circuit 34 provides a series of pulses to a horizontal or vertical cursor register 30 or 32 corresponding to the number of characters or lines to be skipped to achieve a predetermined cursor skip.

Now, as shown in FIG. 3, when the screen of the viewer 10 is divided into three sections A, B, and C, in the present invention, the cursor is initially moved from the 1st line to the 16th line within section A. The cursor is configured to move sequentially from left to right in each line, and after the cursor has finished moving on this person's screen, the cursor moves in the same way within the three screens, and then moves to the C screen.

In the case of FIG. 3, the leftmost column of each split screen A, B, and C,
In other words, the first column of each split screen is 0'' and +41, respectively.
311 and 26''.

First, the first row of screen A? T091 is transferred from the external computer 16 to the horizontal cursor register 30 via the cursor control circuit 34, and then the first column "13" of screen B is transferred from the external computer 16 via the cursor control circuit 34 to the first horizontal division position storage register. 36 and stored there,
The leading column 112611 of screen C is similarly stored in the second horizontal division position storage register 38.

A total of n horizontal division position storage registers are prepared, allowing the screen to be divided into (n+1) divisions in the horizontal direction.

Vertical cursor register 32 is populated with u 011 by cursor can control circuit 34 based on external computer 160 commands.

When screen A is displayed, O'' is stored in the first column storage register 40, and the value u13+1 of the first column of screen B is stored in the last column storage register 42.

Currently, 0'' is stored in the horizontal and vertical cursor registers 30 and 32, so the cursor is positioned at the upper leftmost position of the screen.

In this state, when a character to be displayed on the screen is supplied to the buffer memory 14 using the external computer 16 or the keyboard 18, the character code is stored in the refresh memory 12.
At the same time, one pulse is supplied to the horizontal cursor register 30 by the cursor control circuit 34 to change its content to l'' and move the cursor one column to the right.

If you do not need to write characters on the screen, use an external calculator 16.
Alternatively, by instructing the cursor control circuit 34 to move the cursor through the keyboard 18, only the cursor can be moved without writing any characters.

The cursor can also be skipped if necessary.

The contents of horizontal cursor register 30, which increases as the cursor moves horizontally, are compared with the value of the last column storage register, and the value of register 30 is changed to the value of register 42.
13 ++, the cursor control circuit 34 stores the first column storage register 40 in the horizontal cursor register 30.
In addition to memorizing the value of +T O++, the vertical cursor
One pulse is supplied to the register 32.

Therefore, the cursor is moved to the left end of the second line.

Thereafter, in the same manner, the cursor sequentially moves from the 1st column to the 13th column, following the rows as shown in screen A of FIG.

After the cursor has been moved to the last row (16th line) and last column (12th column) of screen A, the register 30
When a match between the value of the register 42 and the value of the last column storage register 42 is detected, the control circuit 34 outputs the value of the last column storage register 42.
13 ++ to the first column storage register 40 and the horizontal cursor
The value of the second horizontal division position storage register 38 is stored in the register 30! +26++ is stored in the last column storage register 42 and the contents of the vertical cursor register 32 are set to 0''.

Therefore, the cursor is positioned at the upper leftmost position of screen B, that is, the 1st row, 14th column.

Thereafter, every time the value of the horizontal cursor register 30, which increases as the cursor moves to the right, matches the value TI 2641 of the last column storage register 42, the value 111341 of the first column storage register 40 is transferred to the horizontal cursor register 30. and supplies one pulse to vertical cursor register 32 to increment its contents by 1''.

Thereafter, the cursor is moved within screen B in the same manner as screen A, and then moved to screen C.

In this case, '40' is stored in the last column storage register 42.
” will be remembered.

If the screen is divided into (n+1) sections in the horizontal direction, registers from the first horizontal division position storage register 36 to the n-th horizontal division position storage register 44 will be used.

As shown in FIG. 4, a case in which the screen is divided not only in the horizontal direction but also in the vertical direction will be described below.

In this case, the screens are A, B, C, D, and E. Since it is divided into 7 sections, F and G, B.

Value of each first column of C, E, F and G II 13B++
26 u, ++ 10 ++, ++ 2011 and 3
o' is stored in the first to fifth horizontal division position storage registers 36, 38, .

Also, the values of the first row of E, F, and G on the screen! +111
+ is stored in the first vertical division position storage register 46.

Furthermore, the contents of the horizontal cursor register 30 and the first column storage register 40 are set to 0'', and the value of the first horizontal division position storage register 36 is set to I+13 in the last column storage register 42.
I+ is stored.

On the other hand, the vertical cursor register 32 and the first row storage register 48 are set to 0'', and the last row storage register 50 is set to 0''.
is the value of the first vertical division position storage register 46 ++,
■++ is memorized.

When the contents of the vertical cursor register 32 match the contents of the last row storage register 50, the value +T O++ of the first row storage register 48 is transmitted to the register 32; The value +411j+ of row storage register 50 is transferred to registers 48 and 32, and '16' is stored in register 50.
・It is supposed to be done.

Therefore, the cursor completes its movement for each split screen, as shown in FIG. 4, and sequentially moves to A.

It is moved in the order of B, C, D, E, F, G (,
If the screen needs to be divided into three sections in the vertical direction, a second vertical division position storage register 52 may be further used.

There are n vertically divided memory registers, and if you use up to the nth vertically divided memory register 54, the screen will be vertically (m+
1) Can be divided into sections.

According to the present invention, when displaying a split screen, the cursor moves within one split screen, and after completing the movement within that split screen, moves to the next split screen. Because it is moved, keyboard operations can be performed systematically, and the cursor movement as described above is made to function at a position independent of the process control function of the external computer. Software on external computers can be simplified.

Note that it is possible to allow movement of the cursor on only one screen out of several divided screens, or it is also possible to prevent the cursor from being displayed on only one screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining a method of displaying characters on the screen in the apparatus shown in FIG. 3 and 4 are diagrams for explaining the movement order of the cursor according to the present invention when the screen is divided.
The figure shows the case where the screen is divided only horizontally, and FIG. 4 shows the case where the screen is divided both horizontally and vertically. 10... Viewer, 12... Memory, 14... Buffer memory, 16... External computer.

Claims (1)

[Claims] 1. In a device in which the display of multiple split screens is controlled by controlling the movement of a cursor, there is a start position storage register that stores the display start position of multiple split screens divided horizontally or vertically, and a register that stores the display start position of the split screen that is divided horizontally or vertically It is equipped with a final position display register that stores the display position and a cursor register that stores and controls the position of the cursor, and controls the cursor for each split screen so that the contents of the cursor register match the contents of the final position display register. What is claimed is: 1. A cursor movement control device in a screen splitting control device, characterized in that when the split screen is displayed, a cursor register is controlled to the leading position of a split screen that is subsequently displayed, and the split screens are sequentially displayed.